The plate heat exchanger is composed of a set of metal corrugated plates. The plate heat exchanger will leak during operation. Internal leakage means that the two media in the plate heat exchanger cause high-pressure side media to leak to low-pressure due to some reasons. The internal leakage phenomenon will have a certain impact on the normal work of the plate changer, and may cause unnecessary losses to the production process. So how do we judge when the plate heat exchanger has internal leakage?
(1) Disassembly and inspection method of heat exchanger
If the area and model of the heat exchanger are not large, you can take the whole machine apart and check whether the plates or gaskets are damaged one by one. When the plate heat exchanger is checked, wipe off the dirt on the surface of the plate, please check whether there is "trachoma". If the sunlight is better, the light transmission method can be used. Please place the plate in the sun to see if there is light coming through. All heat exchanger plates checked out must be replaced. The heat exchanger sealing gasket focuses on checking the position of the second seal. Generally, there will be "water marks", and all the rubber gaskets checked out will be replaced uniformly.
(2) Heat exchanger suppression method
Considering the large-area or larger-model board replacement, the troubleshooting method is time-consuming and labor-intensive. So we recommend the suppression method.It is to remove the inlet and outlet pipes on one side, and block the outlet of the plate heat exchanger with a blind flange. After the inlet is filled with water, it is sealed with a pressure flange. Then use the pressure pump to continuously inject water into it until the pressure gauge shows 1.3 times the normal working pressure. By looking at the value of the pressure gauge, the internal leakage can be ruled out as long as the pressure does not drop for 1 hour. If the pressure drops or drops sharply, it means that there are many internal leakage or internal leakage points, and emergency shutdown and maintenance are required.